barometric pressure
Thread Starter
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Pro
Joined: May 2007
Posts: 585
Likes: 0
From: Ocean County NJ
And that is what I have been saying all along. What does it really matter - hi DA, low DA, blah blah blah. At the end of the day, Dennis was able to pick a specific set of modifications and learn how to launch/drive his car well enough to break into the 10's with appx 400 rwhp. DA did not account for much of that achievement. Some pilots would have you believe otherwise........How are airbus cockpits different from porcupines? Porcupines have their ****** on the outside.
Pro
Joined: May 2007
Posts: 585
Likes: 0
From: Ocean County NJ
NHRA altitude correction factors
Below are the NHRA Altitude Correction formulas for all sportsman categories for NHRA member tracks that are classified as altitude facilities:
NHRA ALTITUDE CORRECTION FACTORS
Comp, S/C, S/G, S/ST
Convert to Sea Level Convert to Altitude
Track Name Alt ET MPH 1/2ET 1/2MPH ET MPH 1/2ET 1/2MPH
DIVISION 4
Amarillo, TX 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
Roswell, NM 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
DIVISION 5
Denver, CO 5800 .9405 1.0563 .9702 1.0281 1.0633 .9467 1.0307 .9726
Douglas, WY 4900 .9508 1.0466 .9754 1.0233 1.0517 .9555 1.0252 .9772
Grand Junction, CO 4800 .9520 1.0455 .9760 1.0228 1.0504 .9565 1.0246 .9777
Great Bend, KS 1900 .9853 1.0143 .9927 1.0072 1.0149 .9859 1.0074 .9929
Julesburg, CO 3500 .9669 1.0315 .9835 1.0158 1.0342 .9694 1.0168 .9845
Pierre, S.D. 1700 .9876 1.0122 .9938 1.0061 1.0126 .9880 1.0062 .9940
Pueblo, CO 4900 .9508 1.0466 .9754 1.0233 1.0517 .9555 1.0252 .9772
DIVISION 6
Acton, MT 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
Anaconda, MT 5100 .9485 1.0488 .9743 1.0244 1.0543 .9535 1.0264 .9762
Ashcroft, CAN 1700 .9876 1.0122 .9938 1.0061 1.0126 .9880 1.0062 .9940
Boise, ID 2700 .9761 1.0229 .9881 1.0115 1.0245 .9776 1.0121 .9887
Lewistown, MT 4100 .9600 1.0380 .9800 1.0190 1.0416 .9634 1.0204 .9814
Medicine Hat, CAN 2400 .9796 1.0197 .9898 1.0098 1.0209 .9807 1.0103 .9903
Prince George, BC 2200 .9819 1.0175 .9909 1.0088 1.0185 .9828 1.0092 .9913
Saskatoon, CAN 1600 .9888 1.0111 .9944 1.0055 1.0114 .9890 1.0057 .9945
DIVISION 7
Albuquerque, NM 5400 .9451 1.0520 .9725 1.0260 1.0581 .9506 1.0282 .9747
Fallon, NV 4000 .9612 1.0369 .9806 1.0185 1.0404 .9644 1.0198 .9819
Inyokern, CA 2400 .9796 1.0197 .9898 1.0098 1.0209 .9807 1.0103 .9903
Las Vegas, NV 2100 .9830 1.0165 .9915 1.0082 1.0173 .9838 1.0086 .9918
Palmdale, CA 2700 .9761 1.0229 .9881 1.0115 1.0245 .9776 1.0121 .9887
Salt Lake, UT 4400 .9566 1.0412 .9783 1.0206 1.0454 .9604 1.0222 .9798
Tucson, AZ 3000 .9727 1.0262 .9863 1.0131 1.0281 .9745 1.0139 .9871
NOTE: Supercharged and/or turbocharged cars (i.e.: AA/A, AA/AT, BB/A, BB/AT, A/PM and AA/PM) use half factor; TA/D and TA/FC cars are not factored.
Below are the NHRA Altitude Correction formulas for all sportsman categories for NHRA member tracks that are classified as altitude facilities:
NHRA ALTITUDE CORRECTION FACTORS
Comp, S/C, S/G, S/ST
Convert to Sea Level Convert to Altitude
Track Name Alt ET MPH 1/2ET 1/2MPH ET MPH 1/2ET 1/2MPH
DIVISION 4
Amarillo, TX 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
Roswell, NM 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
DIVISION 5
Denver, CO 5800 .9405 1.0563 .9702 1.0281 1.0633 .9467 1.0307 .9726
Douglas, WY 4900 .9508 1.0466 .9754 1.0233 1.0517 .9555 1.0252 .9772
Grand Junction, CO 4800 .9520 1.0455 .9760 1.0228 1.0504 .9565 1.0246 .9777
Great Bend, KS 1900 .9853 1.0143 .9927 1.0072 1.0149 .9859 1.0074 .9929
Julesburg, CO 3500 .9669 1.0315 .9835 1.0158 1.0342 .9694 1.0168 .9845
Pierre, S.D. 1700 .9876 1.0122 .9938 1.0061 1.0126 .9880 1.0062 .9940
Pueblo, CO 4900 .9508 1.0466 .9754 1.0233 1.0517 .9555 1.0252 .9772
DIVISION 6
Acton, MT 3700 .9646 1.0337 .9823 1.0168 1.0367 .9674 1.0180 .9834
Anaconda, MT 5100 .9485 1.0488 .9743 1.0244 1.0543 .9535 1.0264 .9762
Ashcroft, CAN 1700 .9876 1.0122 .9938 1.0061 1.0126 .9880 1.0062 .9940
Boise, ID 2700 .9761 1.0229 .9881 1.0115 1.0245 .9776 1.0121 .9887
Lewistown, MT 4100 .9600 1.0380 .9800 1.0190 1.0416 .9634 1.0204 .9814
Medicine Hat, CAN 2400 .9796 1.0197 .9898 1.0098 1.0209 .9807 1.0103 .9903
Prince George, BC 2200 .9819 1.0175 .9909 1.0088 1.0185 .9828 1.0092 .9913
Saskatoon, CAN 1600 .9888 1.0111 .9944 1.0055 1.0114 .9890 1.0057 .9945
DIVISION 7
Albuquerque, NM 5400 .9451 1.0520 .9725 1.0260 1.0581 .9506 1.0282 .9747
Fallon, NV 4000 .9612 1.0369 .9806 1.0185 1.0404 .9644 1.0198 .9819
Inyokern, CA 2400 .9796 1.0197 .9898 1.0098 1.0209 .9807 1.0103 .9903
Las Vegas, NV 2100 .9830 1.0165 .9915 1.0082 1.0173 .9838 1.0086 .9918
Palmdale, CA 2700 .9761 1.0229 .9881 1.0115 1.0245 .9776 1.0121 .9887
Salt Lake, UT 4400 .9566 1.0412 .9783 1.0206 1.0454 .9604 1.0222 .9798
Tucson, AZ 3000 .9727 1.0262 .9863 1.0131 1.0281 .9745 1.0139 .9871
NOTE: Supercharged and/or turbocharged cars (i.e.: AA/A, AA/AT, BB/A, BB/AT, A/PM and AA/PM) use half factor; TA/D and TA/FC cars are not factored.
Now that Airpuss has had a complete internet spanking, I rest my case and will return to practicing law (legal, not physics) in my own jurisdiction.
Please return your seat backs and tray tables to their full, upright and locked positions................
Safety Car
Joined: Sep 2006
Posts: 3,922
Likes: 4
From: Cheektowaga NY
St. Jude Donor '08
And that is what I have been saying all along. What does it really matter - hi DA, low DA, blah blah blah. At the end of the day, Dennis was able to pick a specific set of modifications and learn how to launch/drive his car well enough to break into the 10's with appx 400 rwhp. DA did not account for much of that achievement. Some pilots would have you believe otherwise........How are airbus cockpits different from porcupines? Porcupines have their ****** on the outside.
Drifting
Joined: Jan 2008
Posts: 1,529
Likes: 23
In my stock tuned 08z the difference in e.t. is IMO about .25-.30 from a day with +500DA to one with say -1500DA. I'm doing a rental day Thursday at MIR. It's supposed to be in the 40's with a slightly negative DA. I haven't raced in those kind of conditions yet but IF traction is good according to my guess I should be in the 11.20's mabey even high teens. Traction could suck if the sun isn't out. The prep might not be up to their normal standards so traction could suck. Mabey I'll have an off day. Too many variables to figure out what's really going happen. Anybody got a traction/DA/driver ability at MIR calculator?
Pro
Joined: May 2007
Posts: 585
Likes: 0
From: Ocean County NJ
In my stock tuned 08z the difference in e.t. is IMO about .25-.30 from a day with +500DA to one with say -1500DA. I'm doing a rental day Thursday at MIR. It's supposed to be in the 40's with a slightly negative DA. I haven't raced in those kind of conditions yet but IF traction is good according to my guess I should be in the 11.20's mabey even high teens. Traction could suck if the sun isn't out. The prep might not be up to their normal standards so traction could suck. Mabey I'll have an off day. Too many variables to figure out what's really going happen. Anybody got a traction/DA/driver ability at MIR calculator?
Airbus has the answer, don't you boy.................. Maybe when he is done serving the passengers in coach he will enlighten you and lead you to the promised land. Or, in the alternative, he will tell you how smart he is, that I am schmuck, and that your good time in the 1/4 is solely related to DA.
To properly determine the answer, you need to prep the 7th Fetzer valve with some gauze, 30 weight oil and ball bearings. Come on, you know it is all ball bearings these days.............. Love the shape of that wing!
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Are you saying dew point and relative humidity aren't related???
http://www.dragtimes.com/da-density-...calculator.php
http://wahiduddin.net/calc/calc_da.htm
http://einstein.atmos.colostate.edu/.../Humidity.html
http://www.dragtimes.com/da-density-...calculator.php
http://wahiduddin.net/calc/calc_da.htm
http://einstein.atmos.colostate.edu/.../Humidity.html
Team Owner
Joined: Feb 2001
Posts: 27,253
Likes: 133
From: Short Hills, NJ
It's actually no secret that Dennis50nj has yet to experience a track visit with ALL of those critical factors occurring all at the same moment in time.
He's a great driver no doubt and he's been to the track when the prep was good but the air wasn't and also when the air was good but the prep wasn't as sticky as previous visits.
But umm, Dennis has yet to be at the track, with his 'still bolt ons only' car set up exactly as it is right now, in great air and good track prep all once.
We'll all just have to wait and see what happens when that perfect storm comes together. 
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Team Owner
Joined: Feb 2001
Posts: 27,253
Likes: 133
From: Short Hills, NJ
Why? Should he?
I don't see the guys in CA telling everyone that their cars ran their bests in better air then what the guys in CO get either for that matter.
Race Director
Joined: Nov 2000
Posts: 11,221
Likes: 899
From: CA
2017 C5 of the Year Finalist
St. Jude Donor '08
Even though some of you guys did not believe me when I said I'm not avid drag racer, it was and is the truth. I'd much rather hit the open mountain roads, or the roadcourse. For me, that's where a stick shift Corvette really shines!! I have not been to the drags since well before the summer, and that's for the above reason mostly, but also somewhat for the following reason:If I do go to the drags, it mostly to verify HP for the non believers...
That's not to say I don't enjoy the rush of a good pass or a nice set of shifts!!!
My 2 cents on the DA and our boy Dennis is that he is a smart, well seasoned drag racer. His car is set up to optimize his HP in a quarter mile run. His auto combo has been unbeatable so far...
Yes, I think da plays a small role in his best times, but it is just part of the puzzle. Would I love to hit Atco on a neg 1000 da day, let alone a neg 2000 da??? Sure I would!
It did kinda suck when we had 3600 da tracks to run on here last year, and certain folks wanted to then say my HP was not what it should be, since I only ran 119.8 MPH. With no real changes, I later went to SAC, and caught a 500 da day. Then some called BS when I ran 123+ most of the day, with a 124 MPH run as well.
Well, do or die, I'll be on the dragstrip this Saturday for the first time in many months. It's a private track day at Famosa raceway, with high temps expected in the low 70s...
Carry on.
Team Owner
Joined: Feb 2001
Posts: 27,253
Likes: 133
From: Short Hills, NJ
I wasn't actually trying to single you out LOL.I was merely trying to make the point that if we in the Northeast are going to have to have our results and weather conditions scrutinized and compared to all other places around this great nation of ours every single time we run then I want EVERYONE ELSE to have to go through that as well.
In other words, unless one is running at Denver in July or August then one's times are ALSO very likely better than they would be somewhere else so I ask of those people, please, no offense, shut the hell up about it.
Thread Starter
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
Not true.
It's actually no secret that Dennis50nj has yet to experience a track visit with ALL of those critical factors occurring all at the same moment in time.
He's a great driver no doubt and he's been to the track when the prep was good but the air wasn't and also when the air was good but the prep wasn't as sticky as previous visits.
But umm, Dennis has yet to be at the track, with his 'still bolt ons only' car set up exactly as it is right now, in great air and good track prep all once. We'll all just have to wait and see what happens when that perfect storm comes together.
It's actually no secret that Dennis50nj has yet to experience a track visit with ALL of those critical factors occurring all at the same moment in time.
He's a great driver no doubt and he's been to the track when the prep was good but the air wasn't and also when the air was good but the prep wasn't as sticky as previous visits.
But umm, Dennis has yet to be at the track, with his 'still bolt ons only' car set up exactly as it is right now, in great air and good track prep all once.
We'll all just have to wait and see what happens when that perfect storm comes together. 
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Airpuss in Red, me in Black
Bull****, otherwise you wouldn't have opened your little mouth, but thanks for the thoughtful contribution
If you agreed with my DA explanation then you must agree that is not just 20 rwhp, figure 3% per 1000' DA power increase over worse DA, whatever that may be.
Again, your arrogance is assuming I agreed. I never said I agreed with your calculation. I thanked you for your explanation. I will now retract the thanks so as not to cause you further confusion.
Welcome to the club, and since you have a forced induction car you should also be aware that DA isn't near a major player because FI cars make their own atmosphere. Reread what I just said, I didn't say it didn't matter, but that the power differences between different DA's is not 3%, far less. I've owned a twin turbo LS2.
Had a forced induction car. As I said in a prior post (without reading yours first), I agreed that FI cars create their own atmosphere. Finally we agree on something.
I will if you'll stop crying, please. lol
Haven't cried yet Airpuss, just trying to point out that DA is not everything, something you have insinutated as being the sole reason for Dennis breaking into the 10's.
Actually I was tired of trying to read text that someone was too lazy to proofread and the run on sentences made little sense.
Next time, maybe I will abandon punctuation altogether. I did not realize that my paper was being graded.
And I'll return the favor, you're acting like an idiot that felt so self important he had to inject himself in this discussion.
Thanks for pointing out what I already acknowledged, Capt. Obvious.
I never said it was, but the oversensitive types, like yourself, like to read into it as some sort of personal attack then try and take what I said to the illogical extreme or totally take what I said out of context, including just making up what I said.
Funny, I never took it as a personal attack. I read what you wrote and chose to disagree. I took offense to you challenging the intelligence of others because you think that you are the all knowing pilot. Just because you fly near G-D does not mean you are G-D.
Because it's so difficult to drive an automatic transmission car? There are plenty of variables, never disputed that, but you cannot deny the effects of DA without looking like an idiot. But you're doing a good job.
Actually its a paddle shifted car. If it looks so easy to you, get yourself a ride in F-1. Let me know how that works out for you.
Dude, don't go away mad. Just go away.
Bull****, otherwise you wouldn't have opened your little mouth, but thanks for the thoughtful contribution
If you agreed with my DA explanation then you must agree that is not just 20 rwhp, figure 3% per 1000' DA power increase over worse DA, whatever that may be.
Again, your arrogance is assuming I agreed. I never said I agreed with your calculation. I thanked you for your explanation. I will now retract the thanks so as not to cause you further confusion.
Welcome to the club, and since you have a forced induction car you should also be aware that DA isn't near a major player because FI cars make their own atmosphere. Reread what I just said, I didn't say it didn't matter, but that the power differences between different DA's is not 3%, far less. I've owned a twin turbo LS2.
Had a forced induction car. As I said in a prior post (without reading yours first), I agreed that FI cars create their own atmosphere. Finally we agree on something.
I will if you'll stop crying, please. lol
Haven't cried yet Airpuss, just trying to point out that DA is not everything, something you have insinutated as being the sole reason for Dennis breaking into the 10's.
Actually I was tired of trying to read text that someone was too lazy to proofread and the run on sentences made little sense.
Next time, maybe I will abandon punctuation altogether. I did not realize that my paper was being graded.
And I'll return the favor, you're acting like an idiot that felt so self important he had to inject himself in this discussion.
Thanks for pointing out what I already acknowledged, Capt. Obvious.
I never said it was, but the oversensitive types, like yourself, like to read into it as some sort of personal attack then try and take what I said to the illogical extreme or totally take what I said out of context, including just making up what I said.
Funny, I never took it as a personal attack. I read what you wrote and chose to disagree. I took offense to you challenging the intelligence of others because you think that you are the all knowing pilot. Just because you fly near G-D does not mean you are G-D.
Because it's so difficult to drive an automatic transmission car? There are plenty of variables, never disputed that, but you cannot deny the effects of DA without looking like an idiot. But you're doing a good job.
Actually its a paddle shifted car. If it looks so easy to you, get yourself a ride in F-1. Let me know how that works out for you.
Dude, don't go away mad. Just go away.
First, are you really comparing your A6 to an F1 car? That just about tells me all I need to know. lol Jesus, that really cracks me up! LOL
The smart guys that drag race with autos let the car do the shifting, but you wouldn't know that, would you?You really seem to have your tampon placed in the wrong orifice, my friend. Hey, I know it's easy to bang on that key board like your all bad and all, but I ain't buying it. I never made a deal out of being a pilot, I only mentioned it as a background for DA calculations, you're the one that seems overly obsessed with that. I'm also a lawyer, do you have anything to say about that to?
While me and Dennis got a little rough with each other, I don't hold anything against him, I know he's a man at least and despite a little arrogance (something I can appreciate
) I wouldn't mind picking his mind on his wealth of knowledge on his combination. I won't get into the DA argument anymore, I know the effects, but you're a liar if you say I ever said that was a sole reason for his obvious and well deserved success.Now, F off Francis.
Pro
Joined: May 2007
Posts: 585
Likes: 0
From: Ocean County NJ
Now I know why you are such a douche - pilot and lawyer to boot - the double whammy. I am so glad I never had the time to pursue a pilot's license - I would really be a pompous ***
Now that this is over, please go commit a physically impossible act and don't come back to your keyboard until your done. Your attempt to do so should occupy the rest of your time here on planet earth as you will find yourself inches short............
I am so glad I never had the time to pursue a pilot's license - I would really be a pompous ***Now that this is over, please go commit a physically impossible act and don't come back to your keyboard until your done. Your attempt to do so should occupy the rest of your time here on planet earth as you will find yourself inches short............
Le Mans Master
Joined: Aug 2008
Posts: 5,578
Likes: 61
From: Austin TX
Now I know why you are such a douche - pilot and lawyer to boot - the double whammy. I am so glad I never had the time to pursue a pilot's license - I would really be a pompous ***
Now that this is over, please go commit a physically impossible act and don't come back to your keyboard until your done. Your attempt to do so should occupy the rest of your time here on planet earth as you will find yourself inches short............
I am so glad I never had the time to pursue a pilot's license - I would really be a pompous ***Now that this is over, please go commit a physically impossible act and don't come back to your keyboard until your done. Your attempt to do so should occupy the rest of your time here on planet earth as you will find yourself inches short............
